Finding the Fourth Proportional to 1,377.61, 2,070.00 and 1,287.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.61 : 2,070.00 = 1,287.62 : x
2. Step 2: Convert to fraction form
   1,377.61/2,070.00 = 1,287.62/x
3. Step 3: Cross multiply
   1,377.61x = 2,070.00 × 1,287.62
4. Step 4: Simplify right side
   1,377.61x = 2,665,366.96
5. Step 5: Solve for x
   x = 2,665,366.96/1,377.61
6. Step 6: Final answer
   x = 1,934.78